Both the endocrine and nervous systems are major regulating systems of the body; However, the nervous system has been compared to an airmail delivery systtem and the endocrine system to the pony express. Briefly explain this comparison.

The correct answer is -the nervous system is rapid whereas the endocrine is slow and effective on distant target organs.

Explanation:

Both the nervous system and endocrine system are essential and major regulating or controlling systems in an organism. The nervous system ae compared to airmail as it uses nerve stimulus to bring rapid control whereas the endocrine is like pony express as it acts much more slowly.

The nervous system is fast and rapid and required electrochemical stimulus or impulses whereas the endocrine system produces hormones and releases them to the blood which then travels to the target organ and binds to it.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.